Apparatus for staking leads to commutators



Nov. 24, 1953 J. J. cuRRlvAN 2,659,959

APPARATUS FOR STAKING LEADS To COMMUTAToRs 2 Sheets-Sheet l Filed Feb. 5, 1949 ffy.

50 22 20 /8 [6\ e W 62 74 y( I2 l 14 INVENTQR. JOHN J cURplI/AN /6/0' ATTORNEK Nov. 24, 1953 J. J. cURRlvAN 2,659,959

APPARATUS FOR STAKING LEADS TO C'ONWIU'I'A'IORS` FiledFeb. 5, 1949 2 sheets-sheet 2 INVEN TOR. JOHN J CURQIVN nu; ATTORNEY.

\ Patented Nov. 24,1953

APPARATUS FOR STAKING LEADS TO COMMUTATORS John J. Currivan, Stamford, Conn., assigner to Electrolux Corporation, 01d Greenwich, Conn., a corporation of Delaware Application February 5, 1949, Serial N o. 74,835

(Cl. .Z9- 34) 2 Claims.

the windings have been mounted on a shaft with a commutator, must be secured to the commutator bars. This may be done by providing a short slot in the end oi each bar adjacent to the winding, placing a loop in the slot and peaning over the edges of the slot in order to secure the loop in place. Thereafter, the excess length of the loop must be cut oir. Heretofore, the peaning and cutting operations have been performed separately and by hand.

In accordance with the present invention I have provided a power operated machine, having an upsetting punch and a cut-off knife so associated that both the staking and cutting operations are performed simultaneously and with a single stroke of the machine.

The above, as well as further objects and advantages of lmy invention will be apparent from the following descrip-tion considered in connection with the accompanying drawings, which form a part of the specification and of which,

Fig. 1 is a perspective view of an apparatus in accordance with my invention;

Fig. 2 is a cross-sectional view of a portion of the apparatus shown in Fig. 1;

Fig. 3 is a cross-sectional view on an enlarged scale of a portion oi the apparatus shown in Fig. 2 together with a portion of a ccmmutator; and

Fig. l is an elevational view of a portion of a commutator after the leads have been staked to the commutator bars.

Referring more particularly to Fig. l, reference character IEB designates a suitable base upon which is mounted a pair of supports I2 and lil. The upper ends of these supports are formed with semi-circular recesses for receiving an armature 'shaft I6. As is well known, this shaft has mounted thereon a commutator I8 and an armature winding 2U. The winding is formed with a plurality of loops 22 coming out from one end thereof, the number of such loops corresponding to the number of bars 2li of the commutator.

Extending upwardly from the base I is a pedestal 26 which carries an arm 28. Recipro- -cably mounted in the arm is a plunger 30, a spring 32 being provided for urging the plunger upwardly. The upper end of the plunger is connected to a power operated member 34 which may constitute the armature of a solenoid or the piston of a power cylinder, either of which may be housed in the casing 36 mounted on the vertical member 38 carried by the arm 28.

Secured to .the lower end of the plunger 3u is a member Il@ provided with a threaded bore 42 extending inwardly from its lower end. Inwardly from the threaded bore is a recess having an end surface 44. A sleeve 45 is threaded into the bore 42 and a locknut 48 is provided for retaining the sleeve in adjusted position with respect to the member 40.

An upsetting punch 50 is reciprocably mounted within the sleeve 46. The punch is provided with a collar 52 which is received in an enlarged portion of the bore of the sleeve 46 and a coil spring 54 is compressed between this collar and a plug 5B which is threaded into the upper end of the enlarged portion of the bore. The lower end of the sleeve d6 is formed as a skirt portion 5S which extends downwardly along one side of the punch 50, the lower end of the skirt portion being ground to form a cutting edge 60.

The above described device operates as follows:

An armature, as is shown in Fig. 1, is placed on the supports l2 and ld. Previously, the winding 2t has been wound on the shaft I6 and the leads 22 extend outwardly from one end of the winding. Likewise, a commutator I3 has been suitably secured to the shaft and the inner end of each bar 24 of the armature has been provided with a short slot 62.

The forward support l2 is lso positioned that, when the outer end of the commutator is held against it, the slots t2 are underneath the punch 59. The operator takes one of the loops 22 and places` it so that an intermediate portion thereof extends through a slot 62. The armature is then turned by hand until this slot is directly underneath the punch 53, whereupon the power device within the casing 36 is operated, as by means of a foot treadle, so as to move the plunger 30 and member 40 downwardly. As soon as the lower end of the punch strikes the commutator, the punch stops but the plunger 30 and member lil` continue to move downwardly, thus compressing the spring 54. The presence of the punch spanning the 'slot 62 assures that the loop 22 remains in the slot during the subsequent staking and cutting operations. When the surface 44 strikes the upper end of the punch, there is imparted a sharp hammer-like blow or impact to the latter which causes its lower end to upset the metal at the edges of the slot G2, thus peaning the metal over the wire of the loop 22 which is within the slot, as is shown at 64 in Fig. 4. At sulostarrtiaflly'I the Sametime theV cutting, edge Sli-.oi the skirt portion tzsevers` the excess length of the loop beyond the point Where the loop has been staked to the commutator bang, as is shown in Fig. 3. Thereafter, the next loop is placed in a slot 62 and the commutator rotated sufliciently so as to bring this slot underneath the punch.

Inasmuch as the relative motion between.. the. sleeve 46 and the punch 59 is terminated by the end of the punch being struckby the surface 44. on the member 49, the length of the stroke` of" the punch relative to the member 46 bevaried by adjusting ther latter member with respectto thel member se. Such adjustment may beaccomplished by looseningthe locknut. 48 and turning the sleeveinto-.or out ofthe bore 42.. Such adjustment is desirable in order thatproper initialrelationship may be obtained between the cutting edge- 69- and the end of the punch when the latter is in its` fully retracted position. Also, it is of course necessary to occasionally grind down the lower end of the skirt 58- in order to resharpen the. cuttingl edge 69, and this shortening of the skirt, may be compensated by turning the sleevel i6 outwardly from the member 40so thatV the vertical distance between the lowerV end of the punch and the cutting edge will remain constant.

The fact that the punch 591s reciprocable with respect to the4 sleeve 4.6 and member 49 not only results-in the*Y advantage of. the punch receiving a sharp: hammer-like blowbut it also makes it possible to` have the lower endY of the punch in close proximity to the commutator when the punchV is in extended position, While stillproviding a stroke of. szucient lengthy for the plunger 36: and member 46'. In order that the operator. may lineup the punch properlyV with the slot it is essential that the.. punch befairly close to the slot. However', if the stroke of. the plunger 365 and member 40 were limited. to sucha short distance, there would not be sufficient impact' to properly upset the metal of the commutator-:ban By making the punch slidable in the sleeve 46, bothclcse: proximity tothe slotv and a stroke of' sufficient. length` are obtained.

AsV the successive loopsare staked tothe: com,- mutator4 bars a piece of. insulating tapey 56, fed throughahole 63 in the base l0 froma roll suite ably supported therebeneath, may bezwrapped' around the leads between the point.: where they are staked to the commutator and the point where they come out of the winding. The purpose of this tape is to retain the leads in position during the subsequent impregnating step and to aid in preventing the leads from being bowed outwardly by the action of centrifugal force when the armatureffisi rotated; at high speedzin the motor or generator of which itbecomes'apart.

While I have described one more or less specic embodiment of my invention this has been done for purposes of illustration only and the scope of' my.' invention is'not to be limited thereby, but is' to be determined from the appended claims.

1f'. Actuel: forv staking leads to commutator bars comprising Yabod'yfmember adapted to be mounted for reciprocatiorn an elongated punch having a punch surface at one end, means mounting the punclr for reciprocating movement in said body member, means urging said punch outwardly of said; body member to alimited extent, a cutter immovably; mounted onand relative-to said body member. and; having a cuttingv edge adjacent one side only of said punch with its edge effective in the same direction as said punch, andmeans on said body member for engaging the other end of said punch when the punch is retracted by engagement with a commutator to positively strike said other end-.and deliver a blow to said punch, the length of said punch relativetothe distance. between said cutting edge and the last mentioned means being such that said punchisurface cannot be retracted inwardlyl of said cutting edge.

2. The structure of. claim 1- having cooperating means for maintaining said body member and. said punch mounting means in assembled relation in a.` manner to afford axial adjustment of said punch mounting; means. relative to said body member.

JOHN J. CURRIVAN.

Referencesv Cited in the le of this patentv UNITED STATES' PATENTS Number. Name Date 184,579 Briggs Nov. 21, 1876 345,655. Wood.` July 13, 1886 348,441 White Aug. 31, 1886 771,669 Schneegass Oct. 4, 1904 1,899,168 Junkers; June 9, 1931 1,671,649 Furman; Aug. 28,1934 2,056,534 Pooley Oct. 6,1936 2,074,366 Collins etal. Mar. 23, 1937 2,372,029 Stair Mar. 30, 1945 2,385,619 Faussetet. al. Sept. 25, 1945 2,451,488 Huntington Oct. 19, 1948 

